Dehumidifier from a walk-in freezer unit?

In summary, Bill is considering building a dehumidification kiln using two 1-1/2 ton refrigeration units for a walk-in freezer. Each unit would freeze an 8' x 10' freezer to -20 degrees. He wants to use a freezer compressor and condenser for the kiln, but is unsure if the temperatures generated by the system will work for his desired temperature range. He also has a walk-in refrigerator condenser that he may match with the compressor unit. The success of this system will depend on finding the right balance of airflow and temperature to keep the refrigerant temperature high enough to condense water without freezing it. A periodic defrost cycle would also be helpful. Access to the design pressures of
  • #1
makeitshine2
2
0
I have 2 each 1-1/2 ton refrigeration units for a walk-in freezer. I would like to build a dehumidifation kiln to dry lumber. Each unit would freeze an 8' x 10' freezer to -20 degrees.

How hard would it be to use a freezer compressor and condensor as a dehumidifier? How would it work?

Thanks for your help!

Bill
 
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  • #2
Welcome to PF.

The difficulty here is that the temperatures generated at each coil are largely a function of the physical properties of the refrigeration system: the refrigerant, its pressure and the compression ratio. As a result, your evaporator is going to "want" to be at -30 or so and it will be very hard for you to keep it from frosting over.
 
  • #3
Russ,

The condensor for a freezer has heat strips built-in and will run a defrost cycle as programmed. Would this be enough?

I also have a condensor that is refrigeration. (for a walk-in refrigerator) Perhaps I could match that with the compressor unit!

Thank You,
Bill
 
  • #4
What is the operating temperature of this "kiln" going to be? It would be a balancing act, but it may be possible for this to work if you have enough airflow and temperature to keep the leaving refrigerant temperature high and the condensation from getting too cold. You'll want to strike a balance, having little enough airflow that it gets cooled enough to condense water but enough airflow that it doesn't freeze the water on the coils.

Are you using this system as the only source of heat/dehumidification for the system? Ie, are you using the condenser heat to warm the "kiln" while using the evaporator to dehumidify it?

A periodic defrost cycle would certainly help.

Whatever parts you use, do you have access to the operating points of the cycle, meaning the design pressures? That would help a lot in figuring out how to make the performace work.
 

1. How does a dehumidifier from a walk-in freezer unit work?

A dehumidifier from a walk-in freezer unit works by pulling in humid air from the surrounding area and passing it over a cold evaporator coil. The cold coil causes the moisture in the air to condense into water droplets, which then fall into a collection tank or are drained away. The dry air is then released back into the room, reducing the overall humidity level.

2. What is the ideal humidity level for a walk-in freezer unit?

The ideal humidity level for a walk-in freezer unit is between 40-60%. This level helps to prevent the growth of mold and bacteria, while also maintaining the freshness and quality of the stored items.

3. How often should a dehumidifier from a walk-in freezer unit be serviced?

A dehumidifier from a walk-in freezer unit should be serviced at least once a year, or more frequently if it is being used in a high-humidity environment. Regular maintenance includes cleaning or replacing the air filter, checking the evaporator coil for ice buildup, and inspecting the drainage system for any clogs or leaks.

4. Can a dehumidifier from a walk-in freezer unit be used in other areas besides walk-in freezers?

Yes, a dehumidifier from a walk-in freezer unit can be used in other areas such as basements, garages, or storage rooms. However, it is important to make sure the unit is designed for the specific humidity levels and temperature range of the desired area.

5. Are there any safety precautions to take when using a dehumidifier from a walk-in freezer unit?

Yes, there are some safety precautions to keep in mind when using a dehumidifier from a walk-in freezer unit. It is important to regularly check and empty the collection tank to prevent overflow. The unit should also be kept away from any sources of heat or high-traffic areas to avoid any accidents. Additionally, make sure to follow the manufacturer's instructions and safety guidelines for proper usage.

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